Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 10: Supplementary services stage 1; Sub-part 10-12: Call hold (CH) (Endorsement of the English version ETS 300392-10-12:2000-02 as German Standard)
Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 10: Supplementary services stage 1 - Sub-part 12: Call Hold (HOLD) (Endorsement of the English version EN 300392-10-12 V1.3.1 (2004-02) as German standard)— 2 стр.
